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Question
justifying the derivation quadratic formula
two of the steps in the derivation of the quadratic formula are shown below.
step 6: $\frac{b^2 - 4ac}{4a^2} = \left(x + \frac{b}{2a}\
ight)^2$
step 7: $\frac{\pm\sqrt{b^2 - 4ac}}{2a} = x + \frac{b}{2a}$
which operation is performed in the derivation of the quadratic formula moving from step 6 to step 7?
○ subtracting $\frac{b}{2a}$ from both sides of the equation
○ squaring both sides of the equation
○ taking the square root of both sides of the equation
○ taking the square root of the discriminant
Para pasar del Paso 6 al Paso 7, se aplica la operación de extraer la raíz cuadrada a ambos lados de la ecuación. El Paso 6 tiene una expresión elevada al cuadrado, y al extraer la raíz cuadrada se obtiene la expresión del Paso 7, incluyendo el signo ± por la propiedad de las raíces cuadradas.
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○ taking the square root of both sides of the equation